Unless you were there, you can't really understand why this concert was so important. The band wasn't that huge, but they were passionate, and on this night, in that hot, cramped venue, the 200 audience members all experienced something unique, and all of them left there changed, and all of them formed bands soon after. Most failed, but several didn't, including a few huge bands. That's why this was the most important concert ever.
That, and the noise complaints to the propery owner getting the venue closed, allowing for the redevelopment to start and radically alter the city. That too.